8.11a Quiz

All living things or organisms in an ecosystem are

• None

• biotic factors

• abiotic factors

Temperature, light, air, water, and climate are all __________ factors of the environment.

• biotic

• abiotic

• None of the above

Fish dying when the temperature goes too high is an example of…

• A biotic factor limiting a biotic factor
• A biotic factor limiting an abiotic factor
• An abiotic factor limiting a biotic factor
• An abiotic factor limiting an abiotic factor

If additional snakes are introduced into this ecosystem, there will most likely be an immediate decrease in the _________.  

• hawk population
• rabbit population
• wildflower population
• grass population

If the grasshopper were to be removed completely from the food web, what organism would be most affected?

• The squirrel

• The shrew

• The deer

• The rabbit

Which two organisms in this food web are COMPETING for food with each other?

• Cougar and Deer
• Rabbit and Snake
• Insects and Grass
• Shrew and Mouse

This graph demonstrates--

• there is no relationship between predator and prey populations.

• changes in the predator population depend on changes in the prey population.

• Predator and prey populations are constantly increasing.

• changes in the prey population depend on changes in the predator population.

A foreign insect is introduced into the Texas. It eats a lot of leaves, and trees start to become leafless. Many different animals feed on the new insect, but even they cannot control its numbers. Eventually, trees begin to die. Why would a rapid increase of the new insect population cause certain species of herbivores to vanish or be fewer in number?

• They would not have enough to eat. 
• They would not have enough space to live.
• They would not have tree bark to eat.

This diagram shows the variety of organisms that live in different tide zones. Mussels are common organisms that compete for space in intertidal (middle) tide zones. If all of the mussels were removed from zone A, which organisms would likely compete for the space in Zone A?

• Periwinkle and Limpets

• Sea lettuce and Chiton

• Sea urchins and Hermit crabs

• Rock louse and Periwinkle

Plants grow in many different shapes and sizes. Much of their shape depends on an internal structure that is composed of carbon-containing molecules such as cellulose and lignin. Plants that have a strong internal structure can grow larger than other plants because their structure can support their size.

Plants obtain the majority of the carbon necessary for building these structural molecules from —

• air

• microorganisms

• soil

• water